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Investments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | |||||
|---|---|---|---|---|---|---|---|
|
Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
Blackstone's Net Assets
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Sep. 30, 2013
Consolidated Blackstone Funds
|
Dec. 31, 2012
Consolidated Blackstone Funds
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| Investment [Line Items] | |||||||
| Investments | $ 506.3 | $ 500.5 | |||||
| Threshold of individual investment fair value to net assets, percentage | 5.00% | ||||||
| Recognized net gains related to equity method investments | $ 71.3 | $ 81.4 | $ 282.6 | $ 125.4 | |||